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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int pow(int x)
{
int a=x,p=1;
while(a>0)
{
p*=x;
a--;
}
return p;
}
int cifra(int x)
{
if(x==1)
return 1;
else
return cifra(x-1)+pow(x)%10;
}
int main()
{
int n,T[30000];
f>>n;
for(int i=0; i<n; i++)
{
f>>T[i];
g<<cifra(T[i])%10<<endl;
}
return 0;
}